WO2012024246A2 - Soupape de commande à deux papillons et procédé d'utilisation - Google Patents

Soupape de commande à deux papillons et procédé d'utilisation Download PDF

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Publication number
WO2012024246A2
WO2012024246A2 PCT/US2011/047819 US2011047819W WO2012024246A2 WO 2012024246 A2 WO2012024246 A2 WO 2012024246A2 US 2011047819 W US2011047819 W US 2011047819W WO 2012024246 A2 WO2012024246 A2 WO 2012024246A2
Authority
WO
WIPO (PCT)
Prior art keywords
butterfly valve
valve element
shaft
small
plenum
Prior art date
Application number
PCT/US2011/047819
Other languages
English (en)
Other versions
WO2012024246A3 (fr
Inventor
John D. Gierszewski
Original Assignee
Caterpillar Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caterpillar Inc. filed Critical Caterpillar Inc.
Publication of WO2012024246A2 publication Critical patent/WO2012024246A2/fr
Publication of WO2012024246A3 publication Critical patent/WO2012024246A3/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/223—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves with a plurality of valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1005—Details of the flap
    • F02D9/102—Details of the flap the flap having movable parts fixed onto it
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1035—Details of the valve housing
    • F02D9/1055—Details of the valve housing having a fluid by-pass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/52—Means for additional adjustment of the rate of flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K39/00—Devices for relieving the pressure on the sealing faces
    • F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
    • F16K39/028—Devices for relieving the pressure on the sealing faces for lift valves with pivoted closure members, e.g. butterfly valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86928—Sequentially progressive opening or closing of plural valves
    • Y10T137/86936—Pressure equalizing or auxiliary shunt flow
    • Y10T137/86944—One valve seats against other valve [e.g., concentric valves]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86928—Sequentially progressive opening or closing of plural valves
    • Y10T137/86936—Pressure equalizing or auxiliary shunt flow
    • Y10T137/86944—One valve seats against other valve [e.g., concentric valves]
    • Y10T137/86984—Actuator moves both valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86928—Sequentially progressive opening or closing of plural valves
    • Y10T137/87016—Lost motion
    • Y10T137/8704—First valve actuates second valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining
    • Y10T137/87523—Rotary valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining
    • Y10T137/87523—Rotary valve
    • Y10T137/87531—Butterfly valve

Definitions

  • This disclosure relates generally to butterfly valves and method for controlling a fluid flow through a plenum using a dual butterfly valve.
  • Butterfly valves are valves which can be used for isolating or regulating fluid flow through a pipe, passageway or plenum.
  • the closing mechanism is in the form of a disk. Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they are lower in cost to other valve designs.
  • the disc is positioned in the center of the pipe or plenum.
  • a rod passes through the disc and is connected to an actuator.
  • the actuator turns the disc either parallel (open) or perpendicular (closed) to the flow.
  • the disc is always present within the flow, therefore a pressure drop is always induced in the flow, regardless of valve position.
  • a butterfly valve may also be opened incrementally to throttle flow.
  • Exhaust gas recycling (“EGR”) equipment directs exhaust gas flowing through an exhaust pipe of an engine for mixing with intake air flowing through an intake pipe to burn particulates trapped in a diesel filter. Other toxic substance in the exhaust gas may be combusted as well. EGR is used to reduce NOX emission produced in the combustion process. However too much EGR will cause the engine performance to suffer. Therefore the EGR must be precisely regulated.
  • Butterfly-type exhaust gas control valves for adjusting the EGR are known.
  • the butterfly valve operates by a torque motor or actuator through a valve shaft.
  • precise control of the exhaust gas flow is limited, especially when a low flow rate is desired.
  • Currently available butterfly valves normally operate best in fully open or fully closed positions. Thus, a need exists for an improved butterfly-type valve or improved alternatives that provide improved flow control.
  • a valve for a plenum or pipe may include a large butterfly valve element pivotally supported in the plenum by at least one rod.
  • the large butterfly valve element may include be coupled to a small butterfly valve element.
  • the small butterfly valve element may be coupled to the rod by a shaft.
  • the shaft may include a recess that accommodates the small butterfly valve element.
  • the recess of the shaft may be disposed between two opposing walls. Each wall may provide a clearance between the small butterfly valve element and the shaft to permit limited rotation of the small butterfly valve element before the small butterfly valve element engages a wall of the shaft.
  • a valve for controlling the fluid flow.
  • the valve may include a large butterfly valve element pivotally supported in a plenum by at least one rod.
  • the large butterfly valve element may be coupled to a small butterfly valve element.
  • the small butterfly valve element may be coupled to the rod by a shaft.
  • the shaft includes a recess that
  • the recess of the shaft may be disposed between two opposing walls. Each wall may provide a clearance between the small butterfly valve element and a shaft to permit limited rotation of the small butterfly valve element before the small butterfly valve element engages the walls of the recess of the shaft to thereby move the small butterfly valve element towards an open or partially open position.
  • the large butterfly valve element may be coupled to a spring for biasing the large butterfly valve element towards a closed position.
  • the small butterfly valve element may be coupled to an actuator for moving the small butterfly valve element between open and closed positions.
  • a method for controlling fluid flow through a plenum includes installing a valve in the plenum.
  • the valve includes a large butterfly valve element pivotally supported in the plenum by at least one rod.
  • the large butterfly valve element may be coupled to a small butterfly valve element.
  • the small butterfly valve element may be coupled to the rod by a shaft.
  • the shaft may include a recess that accommodates the small butterfly valve element.
  • the recess of the shaft may be disposed between two opposing walls with each wall providing a clearance between the small butterfly valve element and the shaft to permit limited rotation of the small butterfly valve element before the small butterfly valve element engages the walls of the recess of the shaft to thereby move the small butterfly valve element towards an open position.
  • the small butterfly valve element may be coupled to an actuator for moving the small butterfly valve element between closed and open positions.
  • the large butterfly valve element may be coupled to a spring for biasing the large butterfly valve element towards a closed position.
  • the method includes moving the small butterfly valve element to engage at least one wall of the recess of the shaft to provide limited flow through the plenum.
  • the method may further include continuing to rotate the small butterfly valve element resulting in rotation of the large butterfly valve element towards an open position to provide greater flow through the plenum as the bias of the spring is overcome.
  • the large butterfly valve element may include an opening, a recess or a cut-out in which the small butterfly valve element is disposed.
  • the large butterfly valve element may be coupled to a spring for biasing the large butterfly valve element towards a closed position.
  • additional rotational movement of the small butterfly valve element overcomes the bias of the spring to move the larger butterfly valve element towards an open position.
  • the spring may be coupled to the rod and the plenum.
  • the large butterfly valve element may be supported in the plenum by a pair of rods.
  • the rods may be disposed diametrically opposite the large butterfly valve element from one another.
  • the shaft may extend axially into the rod.
  • the shaft may extend axially into or through both rods.
  • the small butterfly valve element may be in communication with an actuator for moving the small butterfly valve element between open and closed positions.
  • the spring may couple the rod to the plenum.
  • the clearance between the small butterfly valve element and the walls of the recess of the shaft may range from about 5° to about 30°. In combination with any one or more of the aspects described above, the clearance between the small butterfly valve element and the walls of the recess of the shaft may be about 20°.
  • FIG. 1. is a perspective view of a disclosed dual butterfly valve installed in a plenum
  • FIG. 2. is a side perspective view of the valve and plenum shown in FIG. 1 with the valve in a fully closed position;
  • FIG. 3 is a perspective view of the valve and plenum shown in FIGS. 1 and 2 with the valve in a fully open position;
  • FIG. 4 is a side perspective view of the valve and plenum shown in FIGS. 1-3 with the small butterfly valve element opened about 20°;
  • FIG. 5 is a front perspective view of the valve and plenum illustrated in FIGS. 1-4 with the small butterfly valve element opened about 20°;
  • FIG. 6 is a partial view of the valve illustrated in FIGS. 1-5 particularly illustrating the relationship between the small butterfly valve element and the recess of the shaft in which it is disposed and the clearance provided by the recess of the shaft that permits the small butterfly valve element to rotate a limited amount before causing the large butterfly valve element to rotate and overcome the bias of the spring;
  • FIG. 7 is another partial view of the valve disclosed in FIGS. 1-6 particularly illustrating the rotation of the small butterfly valve element until it engages the recess of the shaft in which it is disposed just prior to imparting rotation to the large butterfly valve element;
  • FIG. 8 is another partial view illustrating about a 70° rotation of the small butterfly valve element which has caused substantial rotation of the large butterfly valve element.
  • a valve 10 which is disposed within a plenum 11 that passes through a base structure 12.
  • the valve 10 includes a large butterfly valve element 13.
  • the large butterfly valve element 13 includes an opening 14, in which a small butterfly valve element 15 is disposed.
  • the small butterfly valve element 15 does not need to be centrally located within the large butterfly valve element 13. Instead, the small butterfly valve element 15 may be a lower or upper section of the large butterfly valve element 13 as will be apparent to those skilled in the art.
  • the small butterfly valve element 15 is supported by the shaft 16 and the large butterfly valve element 13 is supported by a pair of rods 17, 18.
  • One of the rods 17, 18 is coupled to a spring 19 which biases the large and small butterfly valve elements 13, 15 towards a closed position as shown in FIG. 1.
  • the shaft 16 is coupled to an actuator 21 which provides the initial rotation of the shaft 16 and small butterfly valve element 15 as well as the further rotation of the large butterfly valve element 13 as discussed below.
  • valve 10 is disposed in the plenum 11 in a fully closed position.
  • the large butterfly valve element 13 shown is supported in slots 22, 23 in the rods 17, 18.
  • the shaft 16 is also slotted for accommodating the small butterfly valve element 15.
  • FIG. 3 the valve 10 has been moved to a fully open position with the large butterfly valve element 13 being rotated about 90° from the position shown in FIG. 2.
  • the actuator 21 has rotated the shaft 16 about 20° so the small butterfly valve element 15 is just beginning to turn within the large butterfly valve element 13, which has yet to move from the closed position.
  • FIG. 5 is a front or end view of the position shown in FIG. 4, which is a side view.
  • FIG. 6 a partial view of the valve 10 is shown.
  • the shaft 16 includes a recess 25 in which the small butterfly valve element 15 is disposed.
  • the recess 25 includes two clearances 26, 27 that permits limited rotation of the shaft 16 prior to the shaft 16 engaging the small butterfly valve element 15. That is, in the example shown in FIG. 6, the shaft 16 will rotate about 20° before the surfaces 28, 29 of the shaft 16 will engage the small butterfly valve element 15 and cause rotation of the small butterfly valve element 15 out of the opening 14 in the large butterfly valve element 13. In this manner, rotation of the shaft 16 can open the small butterfly valve element 15 slightly, or a small amount as shown in FIG. 7 prior to the opening of the large butterfly valve element 13. In FIG. 7, the small butterfly valve element 15 has been rotated about 20°. In FIG. 8, in contrast, the small butterfly valve element 15 has been rotated about 70° thereby causing the large butterfly valve element 13 to have rotated about 50°.
  • the dual butterfly valve 13, 15 design of the valve 10 enables small or incremental flow through the small butterfly valve element 15 and larger flow once the large butterfly valve element 13 is opened or in the fully open position as shown in FIG. 3.
  • the actuator 21 may be a typical electronic actuator or may form part of an engine control module (ECM).
  • ECM engine control module
  • the rods 17, 18, shaft 16 and butterfly valve elements 13, 15 should be fabricated from materials robust enough to withstand exhaust temperatures of typical gasoline or diesel engines.
  • the disclosed valve is not limited to use in exhaust gas recycling equipment, but may be used for controlling flow through any pipe or plenum and therefore the materials of construction can vary greatly.
  • the rotary spring 19 could be disposed on either rod 18 or 17 and springs other than rotary springs may be utilized as will be apparent to those skilled in the art.
  • Another variation would be to have the small butterfly valve element 15 coupled to the large butterfly valve element 13, but not disposed in a central opening in the large butterfly valve element. Such an embodiment would involve the small butterfly valve element 15 being and upper, lower or side section of the large butterfly valve element 13. The coupling between the small and large butterfly valve elements 15, 13 could be the same or similar.
  • this disclosure provides a valve for a plenum or a pipe to control the flow of fluid through the plenum or pipe.
  • the disclosed valve a dual butterfly valve with a large butterfly valve element pivotally supported in the plenum by at least one rod and typically two rods disposed diametrically opposite the large butterfly valve element from one another.
  • the large butterfly valve element includes an opening for accommodating a small butterfly valve element.
  • the small butterfly valve element is coupled to a shaft that, in turn, is coupled to a rod that supports the large butterfly valve element.
  • the shaft includes a recess in which the small butterfly valve element is accommodated.
  • the recess of the shaft includes two opposing walls, which may be non-planar, but each wall provides a clearance between the small butterfly valve element and the shaft or walls of the recess of the shaft to permit limited rotation of the shaft before the small butterfly valve element is engaged and rotates. After the small butterfly valve element engages a wall of the recess of the shaft, further rotation of the shaft results in rotation of the large butterfly valve element against the bias of the spring or biasing element.
  • a method for controlling fluid flow through a plenum includes installing a valve in the plenum.
  • the valve includes a large butterfly valve element pivotally supported in the plenum by at least one rod.
  • the large butterfly valve element includes an opening for accommodating a small butterfly valve element.
  • the small butterfly valve element may be coupled to the rod by a shaft.
  • the shaft includes a recess that accommodates the small butterfly valve element.
  • the recess of the shaft may be disposed between two opposing walls, neither of which are planar but both of which provide a clearance between the small butterfly valve element and the shaft to permit limited rotation of the shaft before the small butterfly valve element engages the walls of the recess of the shaft to thereby move the small butterfly valve element towards an open position.
  • the small butterfly valve element is coupled to an actuator for moving the small butterfly valve element between closed and open positions.
  • the large butterfly valve element is coupled to a spring or other biasing element for biasing the larger butterfly valve element towards a closed position.
  • the method includes moving the shaft to engage at least one wall of the recess of the shaft with the small butterfly valve element to provide a limited flow through the plenum.
  • the method also includes continuing to rotate the small butterfly valve element with the shaft resulting in rotation of the large butterfly valve element towards an open position to provide greater flow through the plenum.
  • the disclosed designs and method are applicable to a wide variety of applications that involve a fluid flowing through a pipe or plenum where control of the flow is desirable.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lift Valve (AREA)

Abstract

L'invention concerne une soupape pour un plénum ou un tuyau. La soupape comporte un gros élément de soupape à papillon supporté de manière pivotante dans le plénum par au moins une tige. Le gros élément de soupape à papillon comporte une ouverture pour recevoir un petit élément de soupape à papillon. Le petit élément de soupape à papillon est accouplé à la tige par un axe. L'axe inclut un retrait qui reçoit le petit élément de soupape à papillon mais qui comporte un dégagement entre le petit élément de soupape à papillon et l'axe pour permettre la rotation de l'axe avant que le petit élément de soupape à papillon ne s'engage avec au moins une paroi du retrait de l'axe. Ainsi, la combinaison de l'axe et du petit élément de soupape à papillon permet un écoulement limité à travers le plénum. Une rotation supplémentaire de l'axe, par exemple, entraîne la rotation du grand élément de soupape à papillon pour assurer un écoulement plus important à travers le plénum.
PCT/US2011/047819 2010-08-17 2011-08-16 Soupape de commande à deux papillons et procédé d'utilisation WO2012024246A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/857,696 2010-08-17
US12/857,696 US8342206B2 (en) 2010-08-17 2010-08-17 Dual butterfly control valve and method of use

Publications (2)

Publication Number Publication Date
WO2012024246A2 true WO2012024246A2 (fr) 2012-02-23
WO2012024246A3 WO2012024246A3 (fr) 2012-04-12

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WO (1) WO2012024246A2 (fr)

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CN110735989A (zh) * 2019-11-20 2020-01-31 江苏方天电力技术有限公司 一种可降低管道振动的阀门及其使用方法
US11022079B1 (en) 2020-02-21 2021-06-01 Deere & Company Dual element engine gas valve
WO2021171670A1 (fr) * 2020-02-25 2021-09-02 日本碍子株式会社 Échangeur de chaleur
CN114151553A (zh) * 2021-11-29 2022-03-08 西安热工研究院有限公司 一种双阀板同轴的阀型结构
CN114542727A (zh) * 2022-02-23 2022-05-27 李德贵 一种工业蝶阀
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